<!DOCTYPE html>
<html>
    <head>
        <style type="text/css">
            .container{
                    position:relative;
            }
            .search{
                    background-image:url(放大镜图片路径);
                    position:absolute;
                    width:50px;
                    height:50px;
                    top:4px;
                    left:100px;
                    z-index:99;
            }
    </style>
    </head>
    <body>
       
    <div class="container">
            <input type="text" value="aaa" class="sousuo"  /> 
            <div class="search"></div>
    </div>

    </body>
</html>